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x+(x+10)+x+(x+5)=180
We move all terms to the left:
x+(x+10)+x+(x+5)-(180)=0
We add all the numbers together, and all the variables
2x+(x+10)+(x+5)-180=0
We get rid of parentheses
2x+x+x+10+5-180=0
We add all the numbers together, and all the variables
4x-165=0
We move all terms containing x to the left, all other terms to the right
4x=165
x=165/4
x=41+1/4
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